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I have an Alpine MRP-f450 amplifier, running to four Infinity speakers. One of the channels is intermittent in that sound only comes out of that channel at random times, with long periods of silence in between. I have tried switching the speakers, to make sure it wasn't one of my speakers and all of my speakers work, it is that one specific channel on my amp that is the problem. I have adjusted the fade and balance as well to focus on that channel to see if there is any sound coming out of it at all, and there is, but it is just very low, even at maximum volume. I have tried adjusting the filter settings as well to see if that is a problem, but that did not fix anything. Is there anything else I can try, or do I need to buy a new amplifier?

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  • zvergiels May 21, 2009

    Do you mean a loose connection in the amp? I don't think it would be a loose connection or wire outside, due to the fact that I have tried different speakers that I know for sure are working and sound does not come out. Which leads me to believe that that output channel is the source of the problem. All of the inputs into the amp would effect all of the ouput channels as a whole, so this one being the only one screwing up doesn't make much sense to me to think its and input problem. 

  • zvergiels May 21, 2009

    I don't think it would be a loose connection or wire outside, due to the fact that I have tried different speakers that I know for sure are working and sound does not come out. Which leads me to believe that that output channel is the source of the problem. All of the inputs into the amp would effect all of the ouput channels as a whole, so this one being the only one screwing up doesn't make much sense to me to think its and input problem.

  • zvergiels May 22, 2009

    How would the components have gotten weak?

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If you know how to read a schematic, have an oscilloscope and, can solder: and,
If you know how replace the power output transistor on the weak channel then; open the amplifier turn it on connect speakers and, a sound source then apply component cooler to the output transistors and, if the sound comes back replace the transistor that started working again (heat damages transistors) next time put a 12v fan near your amplifier in your car to blow across the heat sink fins to keep it cool and, running a long time.
if not replace the amplifier

Posted on May 22, 2009

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Its the faulty amplifier.its not the wires.its the clear internal circuit board problem as the electrical components have gone weak and so you are getting sound but bit low.
as you mentioned in all the other speaker at that particular connection you are getting bit low volume.this clears that the speakers are not at all faulty.just get the new amplifier and connect the speakers it will work properly.
thanks.please do rate the session.thank you for using fixya.keep updated.

Posted on May 21, 2009

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Could it be a loose connection or cable?

Posted on May 21, 2009

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